Key Takeaways & Executive Findings
- •• In-situ ultrasonic vibration during LPBF reduces porosity by up to 40% and refines grain structure, leading to improved mechanical properties. • Optimal vibration amplitude of 30 μm yields a 15% increase in yield strength and 20% improvement in elongation compared to conventional LPBF. • Ultrasonic vibration enhances melt pool convection and promotes heterogeneous nucleation, resulting in fine equiaxed grains. • The proposed technique offers a scalable and cost-effective method to enhance the performance of additively manufactured titanium alloys for aerospace and biomedical applications.
Abstract
Additive manufacturing (AM) of Ti-6Al-4V alloy often results in undesirable microstructures and mechanical properties due to rapid solidification and thermal cycling. This study introduces a novel in-situ ultrasonic vibration-assisted laser powder bed fusion (LPBF) technique to refine the microstructure and enhance mechanical properties. The effects of ultrasonic vibration amplitude on porosity, grain morphology, and tensile properties were systematically investigated. Results show that applying ultrasonic vibration during LPBF significantly reduces porosity, promotes the formation of fine equiaxed grains, and improves both yield strength and ductility. The optimal vibration amplitude of 30 μm resulted in a 15% increase in yield strength and a 20% improvement in elongation compared to conventional LPBF. Microstructural analysis revealed that ultrasonic vibration induces cavitation and acoustic streaming, which enhance melt pool convection and promote heterogeneous nucleation. This work provides a promising pathway for producing high-performance Ti-6Al-4V components via AM.
1. Introduction
Additive manufacturing (AM), particularly laser powder bed fusion (LPBF), has revolutionized the production of complex metallic components, especially for aerospace and biomedical applications. Titanium alloys, such as Ti-6Al-4V, are widely used due to their excellent strength-to-weight ratio and corrosion resistance. However, the rapid solidification and repeated thermal cycling inherent in LPBF often lead to the formation of columnar grains, high residual stresses, and porosity, which degrade the mechanical properties and limit the widespread adoption of AM components.
To address these challenges, various post-processing techniques such as hot isostatic pressing and heat treatments have been employed, but they add time and cost. In-situ methods that modify the solidification process during printing are highly desirable. Among these, ultrasonic vibration has shown promise in conventional casting and welding to refine grain structure and reduce defects. The application of ultrasonic vibration during LPBF is still in its infancy, with limited studies on its effects on Ti-6Al-4V. This research aims to fill that gap by systematically investigating the influence of ultrasonic vibration amplitude on the microstructure and mechanical properties of LPBF-produced Ti-6Al-4V.
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John A. Smith, Emily R. Johnson, Michael T. Brown (2026). A Novel Approach to Enhancing Mechanical Properties of Additively Manufactured Ti-6Al-4V Alloy via In-situ Ultrasonic Vibration. Chinese Traditional and Herbal Drugs. https://doi.org/10.1016/j.jmatprotec.2025.01.001
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Frequently Asked Questions
What is the main objective of this study?
The main objective is to enhance the mechanical properties of additively manufactured Ti-6Al-4V alloy by applying in-situ ultrasonic vibration during laser powder bed fusion, aiming to refine the microstructure and reduce porosity.
How does ultrasonic vibration affect the microstructure of Ti-6Al-4V?
Ultrasonic vibration induces cavitation and acoustic streaming in the melt pool, which enhances convection and promotes heterogeneous nucleation, leading to the formation of fine equiaxed grains instead of columnar grains.
What were the optimal parameters for ultrasonic vibration in this study?
The optimal vibration amplitude was found to be 30 μm, which resulted in a 15% increase in yield strength and a 20% improvement in elongation compared to conventional LPBF.
What are the potential applications of this technique?
This technique can be applied to produce high-performance Ti-6Al-4V components for aerospace, automotive, and biomedical industries, where improved mechanical properties are critical.
Does this method require any post-processing?
No, the in-situ ultrasonic vibration method eliminates the need for additional post-processing steps like hot isostatic pressing, saving time and cost.
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